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Racing Cylinder POLINI 177 cc

for Vespa 125 GTR 2°/TS/150
Sprint 2°/V/Super 2°/PX125
Ø 63,0mm, cast iron, 7 ports,
stroke 57mm, 2 piston ring(s),
with cylinder head,
ROAD-TUNING, for everyday use
& reliable

For race use only. Not admitted in the area of the German StVZO!

The King of the 177cc class. POLINI sets the standards with this old school classic, the one all cast iron cylinders have to measure up to.

At the plug and play level, this is a powerful cylinder, and with a 60mm long stroke crankcase, can reach 187ccm - incredible! 7 powerful transfers with a triple boost port feed the cylinder. A generous exhaust port and solid ASSO pistons create a solid support.

Power plus starts in the lower ranges. No problems here with changing up gears. With a longer transmission can operate well as a touring cylinder. If you like, the 20mm carburetor can be replaced with the big brother 24/24 SI, and at least, mount a racing shaft. More power and dependability can be yours by adding combustion chamber and compression optimized MMW MALOSSI cylinder head and the GRAND - SPORT 177ccm piston. A larger racing exhaust, carburetor up to 30mm and a modified outlet will pump up your performance even higher, max around 125 km/h, and bring tears to your eyes.

Conclusion: Robust, hefty torque cylinder for daily use. An absolute all-rounder.


Cast Iron/ 63mm Bore/ 7 Transfers/ 177.68ccm

Cast iron cylinder, 57mm stroke, 7 transfers, piston with 2 thick piston rings, original POLINI cylinder head included in delivery, compression 10.6:1, delivery includes set of gaskets. Jets and ignition should be adjusted. The motor casing should be modified to fit the larger cylinder transfers.


SIP-TIP: W4AC spark plug, ignition timing approx. 17-19°, HD SI 20/20 105-110 are a must, carburettor SI 24/24 or 28-30mm, Italian/SIP/J racing exhausts, longer transmission, light flywheel/SIP Performance ignition and race/long stroke crankcase are recommended, full circle /flowed crankshaft and 30mm reed valve carburettor to bring tears to your eyes on the freeway.


SIP-customer Gerhard J., Austria:

"Absolute optimal, drives like a dream on long distances."


SIP-Man Matze:

"Drove the 177er, 28er and Sito Plus 4300 km from Landsberg in Bavaria to Greece. The cylinder took everything in stride, not a single problem!"


There's enormous potential in the 177cc that can be yours with a little modification. If you don't trust yourself to do a perfect job, then get your hands on the Worb5, and get ready to rumble. Your POLINI can develop it's complete potential first with modification.

With the POLINI W5 177cc Race Cylinder the exhaust grows 2 mm to the right and left and also 1.5 mm above up and below. Your exhaust form will be more square. The piston windows are enlarged. The boost channel exit is more angled and the piston smoothed on the interior.

OEM Numbers (for the purpose of comparison)  140.0080 (POLINI)

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Spare Parts
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
LML Star 125 2T/ DLX / Via Toscana / Deluxe 125 2T AC
LML Star 150 2T / DLX / Via Toscana / Star / Stella / Belladonna RV 150 2T AC
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 125 GTR 125 VNL2T 2T AC '68-'78 138957 ->
VESPA 125 TS 125 VNL3T 2T AC '75-'78
VESPA 150 Sprint 150 VLB1T 2T AC '65-'74 105200 ->
VESPA 150 Sprint Veloce 150 VLB1T 2T AC '69-'79
VESPA 150 Super 150 VBC1T 2T AC '65-'79 328129 ->
VESPA COSA 1 150 VLR1T 2T AC '87-'90
VESPA COSA 1 125 VNR1T 2T AC '88-'91
VESPA COSA 2 150 VLR2T 2T AC '91-
VESPA COSA 2 125 VNR2T 2T AC '91-
VESPA P125X 125 VNX1T 2T AC '77-'82
VESPA P150 S 150 VBX1T 2T AC '78-'90
VESPA P150X / PX150 E 150 VLX1T 2T AC '78-'85
VESPA PX125 2011/ 30 Jahre 125 ZAPM74100 2T AC '11-
VESPA PX125 CAT 125 ZAPM50100 2T AC '07-
VESPA PX125 E 125 VNX1T 2T AC '81-'83
VESPA PX125 E '98 / Millenium 125 VNX2T 2T AC '98-'05
VESPA PX125 E Lusso/EFL/Arcobaleno / Elestart 125 VNX2T 2T AC '83-'97
VESPA PX150 2011 150 ZAPM74200 2T AC '11-
VESPA PX150 E '98 / Millenium 150 VLX1T 2T AC '98-'05
VESPA PX150 E Lusso/EFL/Arcobaleno / Elestart 150 VLX1T 2T AC '83-'97,00

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